In Maine, a teenager serves ice cream at a Dairy Queen for the summer. But data show teens' participation in the labor force is on the decline, and it has been for decades.
Jill Brady/Press Herald via Getty Images
A child plays with a mobile phone while riding in a New York subway in December. Two major Apple investors urged the iPhone maker to take action to curb growing smartphone use among children.
A volunteer cleans up needles used for drug injection that were found at a homeless encampment in Everett, Wash., in November. Respondents in a Federal Reserve survey who knew someone who had been addicted to opioids were less likely to give the economy a favorable rating.
Ted S. Warren/AP